I don't think my reply is going to add anything, but I just wanted to agree with a couple of other replies. Yes the age of the vehicle will still cause a car to depreciation in value. T reg for under a grand, regardless of car, I wouldn't want to pay more, unless you're talking about a sports car.
People are looking at more economical cars, so the is' s are not going to be considered by many. They are left for those who like the look and don't care about petrol use, and we are definately in the few. I think that a number of 98-03 is' s could end up being scrapped because people can't afford to run them. £270.00 a year for tax as well!?!
Stuart